Tychobrae Octavia - there are clones out there or get someone to make you one.I've made a Foxx Superfuzz which has a WILD fuzz tone with a switchable octave up, but I think the classic octave up is defo the Tycho. :twisted:
(Though I'd rather just play the 8ve or have another guitarist play it)
Satch uses an EHX POG for that i think - sounds good to me :)